of hamilton



UNITED STATES PATENT OEEIoE.

WM. A. L. KIRK, OF HAMILTON, OHIO, ASSIGNOB TO OWENS, LANE, DYEIt-St OO.

WATER-GRATES.

Specication forming part of Letters Patent No. 59, I 30, dated October 23, 1866.

To all whom it may concern:

Be it known that I, WILLIAM A. L. KIRK, of Hamilton, Butler county, Ohio, have invented a certain new and useful Improved Tubular Grate-Bar; and I do hereby declare the following to be a full, clear, and exact descrip- A represents the water-jacket of a custom-v ary portable or locomotive boiler. Tubes or pipes B are screwed into the rear water-jacket `and supported in front by one or more bearing-bars, C. D is a diaphragm which extends from side to side and from the rear end ofthe tube to near its front end. The front end of each tube is closed by a cap, E, screwed fast to it.

The above provision effectual! y prevents the displacement of water by steam in any part of the tube, the current of cool water from the bottom of the jacket continually displacing in the lower compartment of the tubes that which the heat of the iire has vexpelled from the upper compartment. The screw-caps E, being temporarily removed, enable the tubes to be cleaned when necessary.'

The improvement, although shown here in connection with a portable boiler, is equally applicable to every kind of steam-boiler.

I am aware that boiler-tubes have before been made with longitudinal diaphragms, as described in Henry C. Sargeants patent of March 27,1866. I do not claim the diaphragm, broadly; but

What I do claim, and desire to secure by Letters Patent, is-y The tubular grate-bars B, each provided with a longitudinal diaphragm, D, when the said grate-bars are arranged beneath the firebox and at the lower end of the water-leg A of the boiler, in the manner and for thepurposes herein specified.

In testimony of which invention I hereunto set my hand.

WM. A. L. KIRK.. Witnesses:

GEO. H. KNIGHT, JAI/Ins H. LAYMAN. 

